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Opening Drill
Stacked Plates: Opening Drill® 
Code:
6509
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The Challenge
The customer manufactures steel lift arms for the heavy equipment industry. The customer purchased two new horizontal boring machines in order to produce these parts. Both machines use a single point bore with coated cermet for finish diameters. The work pieces are stacked plates made of A36. They use 430 PSI and synthetic coolant with additives. There were five hole diameters and depths in this complex operation.

Tool used: Kennametal twin head boring bars (2 passes)
  • Hole diameter: 101.7mm
  • Hole depth: 78mm
  • 528 and 790 RPM
  • 430 and 715 SFM
  • 0.015 and 0.012 IPR
  • IPM = 7.95 and 9.48
  • Insert life = 20 minutes of cut time
  • Cycle time = 4 minutes
The Solution
Allied recommended the Opening Drill.

Tool used: Opening Drill (item OP3-1S-CV50)
  • 288 RPM
  • 300 SFM
  • 0.006 IPR
  • 1.73 IPM
  • Tool life = 30 minutes of cut time
  • Cycle time = 2 minutes 18 seconds
The Advantages
The Opening Drills effectively reduced cycle time and increased tool life, accomplishing the customer's goals for this operation.
  • Machine time savings = 42.5% ($200/hr)
  • Increased tool life by 50%